These summaries provided the perfect solution to obtain all the necessary information without needing to open the book. These summaries cover the CAPS gr. 12 IT theory syllabus. Summaries perfect to use before starting with past papers.
*Buy bundle for complete set
Module 4.1
Database design and concepts
Relational Databases
Select: when we choose what entities we want to record and what data about that entity
is important
Structure: what tables we need and what the relationship between the tables are
Normalization
Formal rules applied in a specific order to ensure databases are designed correctly
Series of steps that need to be followed
Third Normal Form: no redundant data: databases we work with
Unprocessed data – data where no entities, attributes or relationships have been identified
Basic Database design
Faster, easier, more accurate, more reliable, more flexible and lest costs
1. Selecting the data
What data you need and where the data can be obtained from
Existing documents: take note of every distinct piece of information
and that it has an appropriate heading
Existing workflows: order in which things get done. Might not appear in
other documentation. Identify data needed to monitor processors
Business plan: document which outlines the strategies to used to ensure
that your business is a success.
2. Structuring data
Place data of each entity in separate tables, determine relationship and link
tables with foreign key
Insert Anomaly Prevents user from capturing data
Delete Anomaly Deleting one piece of data result in the removal of unrelated data
Update When data changes it has to be altered in multiple records
Anomaly
Increases efficiency
Minimizes wastage of storage and memory
Eliminates errors
Data maintenance – keep data current (adding, deleting, and updating records)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller mswillane. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R50,00. You're not tied to anything after your purchase.
